linux-kernel - Re: [PATCH 01/14] drivers: net: dsa: qca8k: handle error with set

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Message-ID: <e2a3fc19-d7ee-3552-e443-ba0190fa4b08@gmail.com>
Date:   Thu, 22 Apr 2021 18:52:10 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/14] drivers: net: dsa: qca8k: handle error with
 set_page



On 4/22/2021 6:47 PM, Ansuel Smith wrote:
> Better handle function qca8k_set_page. The original code requires a
> deleay of 5us and set the current page only if the bus write has not
> failed.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  drivers/net/dsa/qca8k.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
> index cdaf9f85a2cb..a6d35b825c0e 100644
> --- a/drivers/net/dsa/qca8k.c
> +++ b/drivers/net/dsa/qca8k.c
> @@ -133,9 +133,12 @@ qca8k_set_page(struct mii_bus *bus, u16 page)
>  	if (page == qca8k_current_page)
>  		return;
>  
> -	if (bus->write(bus, 0x18, 0, page) < 0)
> +	if (bus->write(bus, 0x18, 0, page)) {
>  		dev_err_ratelimited(&bus->dev,
>  				    "failed to set qca8k page\n");
> +		return;
> +	}

An improvement would be to propagate the return value to the two callers
which themselves do allow an error to be propagated no? If you cannot
set the page you are pretty much toast.
-- 
Florian